I agree with Cat Lady when she mentioned Ring Worm. This is a very contagious fungus and my youngest adoptee had it above his eyes and an inverted V on his forehead. He also had a spot on the back of his neck. Because we have a 19 year old, we had to really be careful and he was segregated for about 2 months. All he knew was a little room but in the end he has bonded with us quite well and is very loving. Ring Worm can take while to heal but I didn't go for the dipping. Too chemical for me. I just used an ointment twice a day and because he was getting good food and gaining weight his immune system got stronger. I think having a vet take a skin scraping is your best bet, before you try using any chemicals thinking it is fleas. Don't buy any ring worm medicine unless it is diagnosed as that is not a good thing to do.
Good luck with your babies. They are dependent yet independent. What would we do without them.